The pressure relief valve on the high pressure side opens at a pressure of approximately 160bar (maximum 170bar) and closes again when the pressure drops (approximately 150bar).

The pressure relief valve on the low pressure side opens at approximately 120bar (maximum 130bar) and closes again at reduced pressure (approximately 110bar).
High pressure side valves with M12X1mm left-hand thread
Low pressure side valve with M14X1mm left-hand thread
The protective film protects the pressure relief valve from contamination and from moisture, and if the protective film is damaged, the pressure relief valve must be replaced